Evolution MotorSports Porsche 991 GT3 Complete Exhaust System

The
new 991 GT3 is an amazing super car of its own right, however it is
lacking that rumble we have grown to expect from a Porsche Supercar.
Although the "exhaust notes" are somewhat reminiscent of GT3's
from previous generations, the stock sounds emitting from this 9,000 RPM
3.8L flat-6 power plant were soft and "muddy." This is where we set out
to create an exhaust system to change all of that.

"Evolution
MotorSports attacks the Porsche 991 GT3 with a vengeance. By designing a
sport exhaust and header system that not only adds significant power
and torque, it also saves weight and gives this new generation GT3 the
growl it is worthy of."

Our
goals were simple, however the path to get there was tedious.
Re-engineering the the OEM bypass controlled exhaust took careful
design, craftsmanship and perseverance in order to produce something
worthy of this super car. We chose to retain the use of an exhaust
bypass valve controlled system and incorporated German made 70mm
Pierburg bypass valves (OEM is 63.5mm) which are controlled with the
sport exhaust button like the OEM system. By utilizing the exhaust
bypass valves, we can retain the sport exhaust controlled switch
function and preserve a quieter exhaust note during cruising speeds for a
virtually unchanged interior cabin sound when compared to the stock
exhaust. When a more aggressive sport exhaust sound is desired, pressing
the sport exhaust button on the center console opens the larger 70mm
exhaust valves and allows the engine to "sing" with melodic exhaust
notes one would expect to hear from a 9,000 RPM flat-6 Porsche GT3.
Increased power, intoxicating sound, and substantial weight savings
equals the perfect combination for ultimate performance without
compromise... PERFORMANCE EVOLVED

Unsurpassed Quality, Fitment & Performance... Made in Arizona.
When we set out to build the finest header system for the Porsche 991
GT3 we had a monumental task in order to create something better than
what Porsche developed. We determined the shortcomings of the OEM system
and made significant improvements to the exhaust flow characteristics.
Our design helps equalize each cylinder's exhaust pulses for better
exhaust scavenging and consistent exhaust temperatures. Additionally we
paid close attention to the exhaust flow into the catalyst which as
recently become a problem with the OEM headers. The flow of the factory
exhaust manifolds into the catalyst as caused excessive heat which
causes this premature catalyst failure and cracking of the factory
header before the catalyst. These issues have been corrected in our
header design which helps reduce exhaust restriction and temperatures
for increased overall power while improving the header integrity.

EVOMS ClubSport Exhaust Features:

• Designed and fabricated by skilled craftsman with over 40 combined years producing Porsche exhausts
• Manufactured in Arizona using the highest quality certified USA stainless steel
• Incorporates 70mm German made exhaust bypass valves and retains OEM sport exhaust sound feature
• More aggressive "on-demand" sport sound - exhaust sound changes with the OEM sport exhaust button
• Non-Sport Exhaust Mode = minimal additional interior noise for highway or daily driving
• Sport Exhaust Mode = intoxicating exhaust notes singing to 9,000 RPM
• Increases HP and TQ - on average ~7hp and 9 lbs./ft. tq gained throughout the power range
• Saves 33 pounds vs. the stock exhaust system - Replaces both side and rear mufflers
• 50 state / SMOG emissions legal
• 100% bolt-on, no modifications. Easy 45 minute installation
• Works with OEM headers or EVOMS ClubSport headers with high flow catalysts
• 16 gauge T-304 stainless steel - mandrel bent and purge welded exhaust tubes
• 16 gauge T-304 stainless steel muffler body with proprietary chambered design for a "drone-free" sound

Weight Comparison:

• OEM 991 GT3 Exhaust: 65 lbs. (29.48 kg)
• EVOMS 991 GT3 Bypass Valve Exhaust: 33lbs (14.96 kg)
• Weight Savings of 32 lbs. (14.51 kg) or 49% lighter than OEM

EVOMS ClubSport Header Features:

• Designed and fabricated buy skilled craftsman with over 40 combined years producing Porsche exhausts
• Manufactured in Arizona using the highest quality certified USA stainless steel
• Incorporates 130mm German made 200 CPI HJS High Flow Catalysts
• Equal length, mandrel bent primary exhaust tubes - all argon purge welded
• Increases HP and TQ - On average ~11HP and ~13lb./ft. tq gained throughout the power range
• 100% bolt-on with no modifications
• Works with OEM Exhaust or EVOMS Bypass Valve Exhaust System

Power Gains of EVOMS Complete Exhaust System:

• Below 5,500 RPM: ~20hp and ~25lb./ft. tq
• Above 6,000 RPM: ~14hp and ~14lb./ft. tq